Add fast mode support to UDP messages and update example apllications

Sub mode and  fast mode flag are  added to the UDP  Status message and
Status messages  after appropriate UI changes.  MSK144 decodes produce
UDP Decode messages. Fast JT9 messages are treated similarly.

Currently ISCAT decodes are not posted  as UDP Decode messages as they
do not fit well with the model.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7389 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

UDPExamples/ClientWidget.hpp

@@ -24,11 +24,13 @@ public:
                          , QString const& id, QString const& version, QString const& revision
                          , QWidget * parent = nullptr);
 
+  bool fast_mode () const {return fast_mode_;}
+
   Q_SLOT void update_status (QString const& id, Frequency f, QString const& mode, QString const& dx_call
                              , QString const& report, QString const& tx_mode, bool tx_enabled
                              , bool transmitting, bool decoding, qint32 rx_df, qint32 tx_df
                              , QString const& de_call, QString const& de_grid, QString const& dx_grid
-                             , bool watchdog_timeout);
+                             , bool watchdog_timeout, QString const& sub_mode, bool fast_mode);
   Q_SLOT void decode_added (bool is_new, QString const& client_id, QTime, qint32 snr
                             , float delta_time, quint32 delta_frequency, QString const& mode
                             , QString const& message);
@@ -69,6 +71,7 @@ private:
   QAbstractButton * auto_off_button_;
   QAbstractButton * halt_tx_button_;
   QLabel * mode_label_;
+  bool fast_mode_;
   QLabel * frequency_label_;
   QLabel * dx_label_;
   QLabel * rx_df_label_;